it is fairly commen that most people say to change the belt at 60k, I remember rading that someone contacted Ford and they were saying to change it around 80k. I beleive most Ford stuff says the belt is a liftime item, figuring by 100k the owner would trade the car so that is lifetime
now that these cars are hitting there second if not third or more owner this doesn't hold anymore
I changed mine at 104k and the belt was fine, it was the pullies that were the issue
so it is your call, a peice of mind call if you will, it could be fine for thousands of more miles or something could go and you are stuck for hours on the side of the road in the middle of nowhere because you know that is when it will go, the moment of least convience